[Webkit-unassigned] [Bug 202696] WKWebView occasionally fails to render content when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202696

--- Comment #7 from teodor.atroshenko at gmail.com ---
We've discovered some interesting behavior. Relevant intro: the app features two WKWebViews, one for interacting with the native APIs and another for loading web content. The two then interact with webkit.messageHandlers.
What we've noticed is that when the app (topmost visible WKWebView) is in a broken state, opening the Safari Preview, then the Develop dropdown menu, expanding XYZ's iPhone submenu and merely mousing-over the "localhost" entry (internal WKWebView, not visible on the screen) restores the rendering on the topmost WKWebView that contains remote content. This is consistent and works every time.
Another interesting thing is that removing all webkit.messageHandlers calls from the native side seems to have resolved the issue, or at least it's not as easily reproduced any more.

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